\\[-1.8ex] Soil Heterogeneity & $-$1.207$^{***}$ & $-$0.257 & $-$0.224 & $-$0.245 & $-$0.106 & $-$0.178 \\ 
  & (0.288) & (0.163) & (0.164) & (0.172) & (0.129) & (0.126) \\ 
\\[-1.8ex] 
Oster $\delta$ for $\beta=0$ &  & 0.47 & 0.44 & 0.52 & 0.22 & 0.40 \\ 
Observations & 21,671 & 21,671 & 21,671 & 21,671 & 21,671 & 21,612 \\ 
R$^{2}$ & 0.018 & 0.564 & 0.594 & 0.607 & 0.622 & 0.631 \\ 
